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Microscopic nonlocal potentials for the study of scattering observables of nucleons within the coupled channel framemork

Authors
  • Nasri, Amine
Publication Date
Sep 14, 2018
Source
HAL-UPMC
Keywords
Language
English
License
Unknown
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Abstract

A good understanding and prediction capacity of neutron scattering cross sections is crucial to many nuclear technologies, among which all kinds of reactors based on fission process. For deformed nuclei, the computation of scattering observables for the elastic channel and the first, low-lying excited states requires coupled channel calculations. Local, phenomenological optical and macroscopic transition potentials are the most commonly used in coupled channel analyses, but their accuracy outside of their fitting range remains unpredictable. Microscopic approaches are being developed in order to improve prediction power and solve the extrapolation issue. Potentials obtained microscopically are nonlocal, and recent studies have emphasized the importance of treating explicitly this nonlocality, without using a localization procedure. Our goal in the present work is to study in a quantum framework with no adjustable parameter, the impact of the nonlocality of potentials on scattering observables of nucleon-nucleus reactions. To achieve this we study neutron scattering with the Melbourne G matrix, which represents the interaction between the projectile and one nucleon of the target, and we describe the target’s structure using the RPA for our first applications to ⁹⁰Zr. In order to be able to study also deformed nuclei, we do our study in the coupled channel framework. The first part of this paper is dedicated to the derivation in a unique, consistent scope of coupled equations for nucleon-nucleus scattering and of the potentials obtained with the Melbourne G matrix and RPA structure input. Secondly, we describe the codes which we wrote during this Ph.D. project: MINOLOP for the computation of microscopic potentials using the Melbourne G matrix and structure inputs given in terms of a 1-body density, and ECANOL for the resolution of coupled channel equations using nonlocal potentials as input. Eventually, we present our first applications using these two codes to study pre-equilibrium emissions due to 2-phonon excitations in ⁹⁰Zr.

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